Refactor GPU resource management and rendering pipeline

- Introduced `Handle<T>` and `Identifier<T>` for lightweight, strongly-typed resource identifiers.
- Replaced `BitSet` with `UnsafeBitSet` for improved performance and memory safety.
- Refactored `Mesh` and `Material` into `MeshClass` and `MaterialClass` for better GPU resource handling.
- Added `D3D12ResourceDatabase` to centralize GPU resource tracking and lifecycle management.
- Updated `D3D12ShaderCompiler` to load shaders from disk and dynamically populate constant buffers and textures.
- Enhanced `ICommandBuffer` with new upload operations for buffers and textures.
- Refactored `Vertex` struct for simplified memory layout and better performance.
- Updated `MeshBuilder` and rendering logic to align with new resource and shader structures.
- Added `BindlessDescriptor` support to `TextureHandle` and `BufferHandle`.
- Removed unused classes and performed general cleanup.
- Updated unit tests and demos to reflect the new architecture.

Ghost.Graphics/Data/CBufferCache.cs

@@ -1,12 +1,9 @@
-using Ghost.Graphics.D3D12;
-using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Buffer;
 using Misaki.HighPerformance.LowLevel.Collections;
-using Misaki.HighPerformance.LowLevel.Helpers;
-using System.Runtime.CompilerServices;
 
 namespace Ghost.Graphics.Data;
 
-internal struct CBufferCache : IDisposable
+internal struct CBufferCache
 {
     public UnsafeArray<byte> CpuData
     {
@@ -14,33 +11,18 @@ internal struct CBufferCache : IDisposable
         set;
     }
 
-    public GraphicsBuffer GpuResource
+    public BufferHandle GpuResource
     {
         get;
     }
 
     private readonly uint _alignedSize;
 
-    internal unsafe CBufferCache(uint bufferSize)
+    internal unsafe CBufferCache(BufferHandle buffer, uint bufferSize)
     {
         _alignedSize = (bufferSize + 255u) & ~255u;
 
         CpuData = new((int)_alignedSize, Allocator.Persistent);
-        GpuResource = GraphicsBuffer.Create(_alignedSize, GraphicsBuffer.Usage.Constant);
-        GpuResource.Name = "Material_CBufferCache";
-
-        UploadToGpu();
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly void UploadToGpu()
-    {
-        GpuResource.SetData(CpuData.AsSpan(), 0);
-    }
-
-    public readonly void Dispose()
-    {
-        CpuData.Dispose();
-        GpuResource.Dispose();
+        GpuResource = buffer;
     }
 }